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deleg_clientmap.go
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/
deleg_clientmap.go
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// Copyright (c) 2020 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal
import (
"context"
"fmt"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
)
var _ clientmap.ClientMap = &delegatingClientMap{}
// delegatingClientMap is a ClientMap, which will delegate calls to different ClientMaps based on
// the type of the key (e.g. a call with keys.ForShoot() will be delegated to the ShootClientMap).
type delegatingClientMap struct {
GardenClients clientmap.ClientMap
SeedClients clientmap.ClientMap
ShootClients clientmap.ClientMap
PlantClients clientmap.ClientMap
}
// NewDelegatingClientMap constructs a new delegatingClientMap consisting of the given different ClientMaps.
// It will panic if `gardenClientMap` is nil.
func NewDelegatingClientMap(gardenClientMap, seedClientMap, shootClientMap, plantClientMap clientmap.ClientMap) clientmap.ClientMap {
if gardenClientMap == nil {
panic("delegatingClientMap must contain a non-nil gardenClientMap")
}
return &delegatingClientMap{
GardenClients: gardenClientMap,
SeedClients: seedClientMap,
ShootClients: shootClientMap,
PlantClients: plantClientMap,
}
}
// errUnknownKeyType is an error that will be returned by a delegatingClientMap if the type of the given key is unknown.
type errUnknownKeyType struct {
calledFunc string
key clientmap.ClientSetKey
}
func (e *errUnknownKeyType) Error() string {
return fmt.Sprintf("call to %s with unknown ClientSetKey type: %T", e.calledFunc, e.key)
}
// errUnsupportedKeyType is an error that will be returned by a delegatingClientMap if it doesn't contain a ClientMap
// that is responsible for the type of the given key.
type errUnsupportedKeyType struct {
calledFunc string
key clientmap.ClientSetKey
}
func (e *errUnsupportedKeyType) Error() string {
return fmt.Sprintf("call to %s with unsupported ClientSetKey type: %T, delegatingClientMap doesn't contain a ClientMap responsible for this key type", e.calledFunc, e.key)
}
// GetClient delegates the call to the ClientMap responsible for the type of the given key.
func (cm *delegatingClientMap) GetClient(ctx context.Context, key clientmap.ClientSetKey) (kubernetes.Interface, error) {
switch key.(type) {
case GardenClientSetKey:
return cm.GardenClients.GetClient(ctx, key)
case SeedClientSetKey:
if cm.SeedClients != nil {
return cm.SeedClients.GetClient(ctx, key)
}
return nil, &errUnsupportedKeyType{
calledFunc: "GetClient",
key: key,
}
case ShootClientSetKey:
if cm.ShootClients != nil {
return cm.ShootClients.GetClient(ctx, key)
}
return nil, &errUnsupportedKeyType{
calledFunc: "GetClient",
key: key,
}
case PlantClientSetKey:
if cm.PlantClients != nil {
return cm.PlantClients.GetClient(ctx, key)
}
return nil, &errUnsupportedKeyType{
calledFunc: "GetClient",
key: key,
}
}
return nil, &errUnknownKeyType{
calledFunc: "GetClient",
key: key,
}
}
// InvalidateClient delegates the call to the ClientMap responsible for the type of the given key.
func (cm *delegatingClientMap) InvalidateClient(key clientmap.ClientSetKey) error {
switch key.(type) {
case GardenClientSetKey:
return cm.GardenClients.InvalidateClient(key)
case SeedClientSetKey:
if cm.SeedClients != nil {
return cm.SeedClients.InvalidateClient(key)
}
return &errUnsupportedKeyType{
calledFunc: "InvalidateClient",
key: key,
}
case ShootClientSetKey:
if cm.ShootClients != nil {
return cm.ShootClients.InvalidateClient(key)
}
return &errUnsupportedKeyType{
calledFunc: "InvalidateClient",
key: key,
}
case PlantClientSetKey:
if cm.PlantClients != nil {
return cm.PlantClients.InvalidateClient(key)
}
return &errUnsupportedKeyType{
calledFunc: "InvalidateClient",
key: key,
}
}
return &errUnknownKeyType{
calledFunc: "InvalidateClient",
key: key,
}
}
// Start delegates the call to all contained non-nil ClientMaps.
func (cm *delegatingClientMap) Start(stopCh <-chan struct{}) error {
if err := cm.GardenClients.Start(stopCh); err != nil {
return fmt.Errorf("failed to start garden ClientMap: %w", err)
}
if cm.SeedClients != nil {
if err := cm.SeedClients.Start(stopCh); err != nil {
return fmt.Errorf("failed to start seed ClientMap: %w", err)
}
}
if cm.ShootClients != nil {
if err := cm.ShootClients.Start(stopCh); err != nil {
return fmt.Errorf("failed to start shoot ClientMap: %w", err)
}
}
if cm.PlantClients != nil {
if err := cm.PlantClients.Start(stopCh); err != nil {
return fmt.Errorf("failed to start plant ClientMap: %w", err)
}
}
return nil
}